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Finding the Fourth Proportional to 395.97, 546.39 and 221.31

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Solution

The fourth proportional to 395.97, 546.39 and 221.31 is: 305.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.97 : 546.39 = 221.31 : x
  2. Step 2: Convert to fraction form
    395.97/546.39 = 221.31/x
  3. Step 3: Cross multiply
    395.97x = 546.39 × 221.31
  4. Step 4: Simplify right side
    395.97x = 120,921.57
  5. Step 5: Solve for x
    x = 120,921.57/395.97
  6. Step 6: Final answer
    x = 305.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.